package com.tech.zhidengxian.util;

/**
 * @description:
 * @author: Holden.ljh
 * @date: 2022/11/4 16:00
 **/

import com.alibaba.fastjson.JSONObject;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpUtil {

    public static String sendFile(String url, File file, Map<String,String> header) {
        String result = "";
        BufferedReader in = null;
        try {

            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.setRequestProperty("Content-Type","multipart/form-data");

            if (header != null && !header.isEmpty()) {
                header.keySet().forEach(key->{
                    String val = header.get(key);
                    connection.addRequestProperty(key,val);
                });
            }
            // 建立实际的连接
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(),"utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }



    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param,Map<String,String> header) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url;
            if (param!=null && !param.isEmpty()){
                urlNameString+="?" + param;
            }
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            if (header != null && !header.isEmpty()) {
                header.keySet().forEach(key->{
                    String val = header.get(key);
                    connection.addRequestProperty(key,val);
                });
            }
            // 建立实际的连接
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(),"utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    public static String sendGets(String url, String[] params) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url;
            if (params!=null && params.length>0){
                urlNameString+="?" + params[0];
                for (int i = 1; i < params.length; i++) {
                    urlNameString+="&" + params[i];
                }
            }
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(),"utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    public static InputStream downloadFile(String url, String param) {
        InputStream inputStream = null;
        try {
            String urlNameString = url;
            if (param!=null && !param.isEmpty()){
                urlNameString+="?" + param;
            }
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();

            // 定义 BufferedReader输入流来读取URL的响应
            inputStream = connection.getInputStream();
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
//            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        return inputStream;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param,Map<String,String> header) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            if (header != null && !header.isEmpty()) {
                header.keySet().forEach(key->{
                    String val = header.get(key);
                    conn.addRequestProperty(key,val);
                });
            }
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数

            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    public static String sendPostWithBody(String url,JSONObject jsonObject,Map<String,String> header){
        OutputStreamWriter writer = null;
        BufferedReader reader = null;
        StringBuffer sbf = null;
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            HttpURLConnection con = (HttpURLConnection)realUrl.openConnection();
            con.setRequestMethod("POST");//请求post方式
            con.setUseCaches(false); // Post请求不能使用缓存
            con.setDoInput(true);// 设置是否从HttpURLConnection输入，默认值为 true
            con.setDoOutput(true);// 设置是否使用HttpURLConnection进行输出，默认值为 false

            //设置header内的参数 connection.setRequestProperty("健, "值");
            con.setRequestProperty("Content-Type", "application/json");
            con.setRequestProperty("isTree", "true");
            con.setRequestProperty("isLastPage", "true");
            if (header != null && !header.isEmpty()) {
                header.keySet().forEach(key->{
                    String val = header.get(key);
                    con.addRequestProperty(key,val);
                });
            }

            //设置body内的参数，put到JSONObject中

            // 建立实际的连接
            con.connect();

            // 得到请求的输出流对象
            writer = new OutputStreamWriter(con.getOutputStream(),"UTF-8");
            writer.write(jsonObject.toString());
            writer.flush();

            // 获取服务端响应，通过输入流来读取URL的响应
            InputStream is = con.getInputStream();
            reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            sbf = new StringBuffer();
            String strRead = null;
            while ((strRead = reader.readLine()) != null) {
                sbf.append(strRead);
                sbf.append("\r\n");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(writer!=null){
                    writer.close();
                }
                if(reader!=null){
                    reader.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return new String(sbf);


    }


}
